Sawdust Wood Pellet Making Process

Sawdust pellet production line includes raw material feeding, screening, drying, cyclone separation, pelletizing, cooling and screening. To ensure the quality of finished pellets, each part of the pellet production line has strict quality control system.

Saw Dust Pellet Production Flow Chart

How to Make Pellets from Sawdust Step by Step?

Raw Materials
Use sawdust as the main raw materials. To ensure sufficient raw material supplement and continuous production, the storage area should be around 500 square meters. You are suggested to prepare 500~600 tons of saw dust, which can ensure at least 15 days of pellet production. The ceiling of raw material warehouse should be able to resistant rain, lighting and wind. Set the production area at least 50 meters away from the living area, 30 meters away from the highway and power transformer. Besides, isolation measure and fire prevention facilities are also necessary, in order to ensure production safety.

Screening
Through screw conveyer, the sawdust will be sent to sieving machine for screening. In this process, large pieces of wood, iron or other impurities will be screened out.

Drying
Biomass pelletizing has strict requirements on the moisture content of raw materials. After screening, the saw dust will be sent to roller dryer by spiral conveyor. In the dryer machine, the sawdust can be dried to preset moisture content through hot air.

Cyclone Separation
After drying, there will be a lot of moisture in the air during the transmission. With cyclone separator, the moisture will be discharged. There are two sets of cyclone separator in this sawdust pellet mill plant. After cooling the sawdust pellets, another cyclone is needed to separate the pellets and moisture.

Conveying
Different conveying processes need different transmission equipment. In this sawdust pellet production line, we adopt two kinds of conveyer: screw conveyor and elevator.

PelletizingSawdust Pelletizer is the key equipment of the complete pellet production line. In this system, we adopt 3 sets of BPM42 Ring Die Pellet Press which is featured of stable operation. The capacity of each set can reach 1.5 ton per hour. This pellet manufacturing machine can process saw dust, corn stalk, haulm, cotton stalks, peanut shells and many other biomass materials. The density of finished pellets can reach 1.0~1.3t/ m3.

Cooling
When discharging from the pallet making machine, the temperature is around 80~90 ℃. The structure is relatively loose and easy to be broken. Through counter flow cooling system, the pellets will be cooled to room temperature and become tight and durable. Then, they can be packaged in bags or be conveyed to storage silo. Except cooling fan, the cooling system is also designed with cyclone separator which is used to separate the powder from the pellets and send the powder back to the front pelletizing procedure.

Screening
After cooling, screening system is needed to filter out broken pellets, so that to ensure the quality of final products. The broken pellets will also be sent to the front pelleting process.

Finished Sawdust Pellets
Now, you have got the final sawdust pellets of high quality. Package the pellets and send them to finished products warehouse, or directly transport the bulk pellets into a storage silo.

Equipment List

Technical Characteristics of Wood Pellets

Sawdust is the most common raw materials for making wood pellets. The density of final pellets is about 1.3t/m3. Wood pellets have lots of advantages such as easy to transport and storage, low ash, low sulfur dioxide and nitrogen oxide emissions, zero carbon emissions and so on. Wood pellet fuel can be widely used in both urban heating and industrial heating. It is a kind of clean, cheap and renewable energy resource. The basic technical parameters are as follows: